body {
    background: url('../img/stone-art.jpg');
    background-repeat: no-repeat;
    background-size: cover;
}

div {
    border: 10px solid hsla(0, 0%, 100%, 0.5);
    background: white;
    max-width: 20em;
    padding: 2em;
    margin: 2em;
    font: inherit;
    background-clip: padding-box;
}